Portable half-step stairway unit



FIG. 1 is a perspective view of a portable half-step stairway unit showing my new design;

FIG. 2 is a further perspective view thereof, on a reduced scale, together with broken lines representing an associated stairway and other like units shown for illustrative purposes in relation to environmental structure and not being part of my claimed design;

FIG. 3 is a front elevational view thereof, the rear elevational view thereof being the same;

FIG. 4 is a side elevational view thereof, looking toward the right side thereof as it appears in FIG. 1, the side elevational view looking toward the left side thereof being the same; and

FIG. 5 is a top plan view thereof; the bottom plan view thereof being the same. 

The ornamental design for a portable half-step stairway unit, substantially as shown and described. 